Merge "Add per-file OWNERS for BatteryStats" am: cac4499628 am: d8a9268460

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1520758

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I74d7cc2d030f7a6e78d8c7e9903a48e93301c5c3